30 CFR § 77.807-2 - Booms and masts; minimum distance from high-voltage lines.

---
identifier: "/us/cfr/t30/s77.807-2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 77.807-2 - Booms and masts; minimum distance from high-voltage lines."
title_number: 30
title_name: "Mineral Resources"
section_number: "77.807-2"
section_name: "Booms and masts; minimum distance from high-voltage lines."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "O"
subchapter_name: "COAL MINE SAFETY AND HEALTH"
part_number: "77"
part_name: "MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 811."
regulatory_source: "36 FR 9364, May 22, 1971, unless otherwise noted."
cfr_part: "77"
---


# 77.807-2 Booms and masts; minimum distance from high-voltage lines.

The booms and masts of equipment operated on the surface of any coal mine shall not be operated within 10 feet of an energized overhead powerline. Where the voltage of overhead powerlines is 69,000 volts, or more, the minimum distance from the boom or mast shall be as follows:

| Nominal power line voltage (in 1,000 volts) | Minimum distance (feet) |
| --- | --- |
| 69 to 114 | 12 |
| 115 to 229 | 15 |
| 230 to 344 | 20 |
| 345 to 499 | 25 |
| 500 or more | 35 |